VLSI implementation of adaptive current controller for high bright LED lighting

An adaptive highly linear current controller for high bright Light Emitting Diode (LED) lighting based on temperature sensor is presented. A highly linear current controller with multiple level temperatures detecting point is proposed and implemented. LED driving current is controlled linearly to reduce the brightness of the LED lighting to avoid the damage of the LED and to extend its life time. The range of temperature supported by this proposed design is from 60°C to 150°C. The proposed adaptive current controller is designed to deliver 100mA. It reduces the LED driving current 10% according to every 10°C rise in the ambient temperature instead of 25% current reduction for every 20°C after 110°C in the existing system. The proposed adaptive current controller reduces the driving current linearly and hence the flickering of LED is avoided compared to the existing system. Schematic and Layout of the proposed current controller is implemented in 0.18μm process technology and the simulation has been carried out using Cadence ADE with Spectre. The proposed adaptive current controller consumes 68.97×26.90 μm2 area and 69.33 μW power.

[1]  Shu-Chuan Huang,et al.  An ultra-small on-chip sensor for temperature and thermal gradient measurements , 2012, 2012 IEEE National Aerospace and Electronics Conference (NAECON).

[2]  Yu-Kang Lo,et al.  LED driver with a combined energy transfer inductor for current balancing , 2014, 2014 International Conference on Intelligent Green Building and Smart Grid (IGBSG).

[3]  M. Arias,et al.  High-Efficiency Asymmetrical Half-Bridge Converter Without Electrolytic Capacitor for Low-Output-Voltage AC–DC LED Drivers , 2013, IEEE Transactions on Power Electronics.

[4]  Jianfeng Wang,et al.  A Capacitor-Isolated LED Driver With Inherent Current Balance Capability , 2012, IEEE Transactions on Industrial Electronics.

[5]  D. G. Lamar,et al.  Design of a Soft-Switching Asymmetrical Half-Bridge Converter as Second Stage of an LED Driver for Street Lighting Application , 2012, IEEE Transactions on Power Electronics.

[6]  Kofi A. A. Makinwa,et al.  A 0.12 mm 2 7.4 μ W Micropower Temperature Sensor With an Inaccuracy of ± 0.2°C (3 Sigma ) From - 30°C to 125°C , 2011, IEEE J. Solid State Circuits.

[7]  Douglas A. Pucknell,et al.  Basic VLSI Design , 1987 .

[8]  S. Hui,et al.  A General Photo-Electro-Thermal Theory for Light Emitting Diode (LED) Systems , 2009, IEEE Transactions on Power Electronics.

[9]  Yu-Kang Lo,et al.  LED backlight driver circuit with dual-mode dimming control and current-balancing design , 2014, 2014 International Conference on Intelligent Green Building and Smart Grid (IGBSG).

[10]  Kamran Souri,et al.  A 0.12mm2 7.4μW micropower temperature sensor with an inaccuracy of ±0.2°C (3σ) from −30°C to 125°C , 2010, 2010 Proceedings of ESSCIRC.

[11]  J. Huijsing,et al.  A CMOS smart temperature sensor with a 3σ inaccuracy of ±0.1°C from -55°C to 125°C , 2005, IEEE J. Solid State Circuits.

[12]  Kofi A. A. Makinwa,et al.  A CMOS smart temperature sensor with a batch-calibrated inaccuracy of ±0.25°C (3σ) from −70°C to 130°C , 2009, 2009 IEEE International Solid-State Circuits Conference - Digest of Technical Papers.

[13]  Changzhi Li,et al.  A 0.45-V MOSFETs-Based Temperature Sensor Front-End in 90 nm CMOS With a Noncalibrated ± 3.5°C 3σ Relative Inaccuracy From -55°C to 105°C. , 2013 .

[14]  Muhammad Saleem,et al.  Analysis and Comparison of DC-DC Boost Converters with High Voltage Conversion Ratio , 2013 .

[15]  Javier Sebasti.  A Very Simple Control Strategy for Power Factor Correctors Driving High-Brightness LEDs , 2009 .

[16]  Changzhi Li,et al.  A 0.45-V MOSFETs-Based Temperature Sensor Front-End in 90 nm CMOS With a Noncalibrated $\pm \hbox{3.5} \ ^{\circ}\hbox{C} \ \hbox{3}\sigma$ Relative Inaccuracy From $-\hbox{55} \ ^{\circ}\hbox{C}$ to 105 $^{\circ}\hbox{C}$ , 2013, IEEE Transactions on Circuits and Systems II: Express Briefs.

[17]  Amine Bermak,et al.  A 405-nW CMOS Temperature Sensor Based on Linear MOS Operation , 2009, IEEE Transactions on Circuits and Systems II: Express Briefs.

[18]  Kofi A. A. Makinwa,et al.  A CMOS temperature sensor with an energy-efficient zoom ADC and an Inaccuracy of ±0.25°C (3s) from −40°C to 125°C , 2010, 2010 IEEE International Solid-State Circuits Conference - (ISSCC).

[19]  E. Waffenschmidt,et al.  Driver Electronics for LEDs , 2006, Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting.

[20]  Paolo Mattavelli,et al.  Optimal Trajectory Control of LLC Resonant Converters for LED PWM Dimming , 2014, IEEE Transactions on Power Electronics.

[21]  Henry Shu-hung Chung,et al.  An LED Lamp Driver Compatible With Low- and High-Frequency Sources , 2013, IEEE Transactions on Power Electronics.

[22]  Xiaogao Xie,et al.  A Novel Output Current Estimation and Regulation Circuit for Primary Side Controlled High Power Factor Single-Stage Flyback LED Driver , 2012, IEEE Transactions on Power Electronics.

[23]  Gun-Woo Moon,et al.  Isolated Switch-Mode Current Regulator With Integrated Two Boost LED Drivers , 2014, IEEE Transactions on Industrial Electronics.

[24]  Chun-Chi Chen,et al.  A Low-Cost CMOS Smart Temperature Sensor Using a Thermal-Sensing and Pulse-Shrinking Delay Line , 2014, IEEE Sensors Journal.

[25]  L. Fanucci,et al.  A Flexible LED Driver for Automotive Lighting Applications: IC Design and Experimental Characterization , 2012, IEEE Transactions on Power Electronics.

[26]  Kofi A. A. Makinwa,et al.  A 1.2V 10µW NPN-based temperature sensor in 65nm CMOS with an inaccuracy of ±0.2°C (3s) from −70°C to 125°C , 2010, 2010 IEEE International Solid-State Circuits Conference - (ISSCC).

[27]  Xiaogao Xie,et al.  Multioutput LED Drivers With Precise Passive Current Balancing , 2013, IEEE Transactions on Power Electronics.

[28]  Ming-Hwa Sheu,et al.  Embedded Temperature Sensor for Multilevel Current LED Driver , 2014, IEEE Sensors Journal.

[29]  Chin-Chung Tsai,et al.  A time-to-digital-converter-based CMOS smart temperature sensor , 2005, 2005 IEEE International Symposium on Circuits and Systems.

[30]  Chien-Hsuan Chang,et al.  A single-stage LED driver for street-lighting applications with interleaving PFC feature , 2013, 2013 International Symposium on Next-Generation Electronics.

[31]  Albert T. L. Lee,et al.  Scalability of Quasi-Hysteretic FSM-Based Digitally Controlled Single-Inductor Dual-String Buck LED Driver to Multiple Strings , 2014, IEEE Transactions on Power Electronics.

[32]  Yu-Sheng Chen,et al.  Study and implementation of high frequency pulse LED driver with self-oscillating circuit , 2011, 2011 IEEE International Symposium of Circuits and Systems (ISCAS).

[33]  Huang-Jen Chiu,et al.  LED Backlight Driving System for Large-Scale LCD Panels , 2007, IEEE Transactions on Industrial Electronics.

[34]  Dong-Hoon Jung,et al.  An Energy Efficient Time-Domain Temperature Sensor for Low-Power On-Chip Thermal Management , 2014, IEEE Sensors Journal.